Windy Tower, Otherworld Tower

I cleared floors 10, 20, 30, 40, and 50 of Windy Tower, and floors 30, 40, and 50 of Otherworld Tower. But for floor 50, based on the standard strategy, Windy Tower seems harder. I did 11 pulls for the Lucky Draw and got one Cosmo. Finally, I have a 4th evolution Cosmo...!!